314 lines
7.5 KiB
C
314 lines
7.5 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* parsing.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: lperrey <lperrey@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2021/10/24 10:52:40 by lperrey #+# #+# */
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/* Updated: 2021/11/02 13:49:06 by hulamy ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "minishell.h"
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size_t count_pipes(t_token *token);
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t_cmd **create_cmd(t_token *token_list, size_t cmd_nbr);
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void handle_argv(t_token *token, t_cmd **cmd, size_t cmd_nbr);
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void handle_path(t_cmd **cmd_arr, char **envp);
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void handle_fd(t_token *token, t_cmd **cmd_arr);
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void fd_heredoc(t_token *token, t_cmd *cmd);
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void fd_redirection(t_token *token, t_cmd *cmd);
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void find_path(char **argv, char **envp);
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int handle_builtin(t_cmd *cmd);
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int fill_builtin(t_cmd *cmd, int (*builtin)(int, char **, t_all *));
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int next_cmd(t_token *token);
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int is_redirection(enum e_token_id id);
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t_cmd **parsing(t_token *token_list, char **envp)
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{
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t_cmd **cmd_arr;
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size_t cmd_nbr;
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if (!valid_syntax(token_list))
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return (NULL);
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cmd_nbr = count_pipes(token_list);
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cmd_arr = create_cmd(token_list, cmd_nbr);
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// cmd_expansion(cmd_arr, envp);
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handle_argv(token_list, cmd_arr, cmd_nbr);
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handle_path(cmd_arr, envp);
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handle_fd(token_list, cmd_arr);
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return (cmd_arr);
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}
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size_t count_pipes(t_token *token)
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{
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size_t nb;
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nb = 0;
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while (token)
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{
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if (token->id == T_PIPE)
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nb++;
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token = token->next;
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}
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return (nb + 1);
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}
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t_cmd **create_cmd(t_token *token_list, size_t cmd_nbr)
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{
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t_cmd **cmd_arr;
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size_t i;
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(void)token_list;
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cmd_arr = ft_calloc(cmd_nbr + 1, sizeof(t_cmd *));
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cmd_arr[cmd_nbr] = NULL;
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i = 0;
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while (i < cmd_nbr)
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{
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cmd_arr[i] = ft_calloc(1, sizeof(t_cmd));
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ft_bzero(cmd_arr[i], sizeof(t_cmd));
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i++;
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}
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return (cmd_arr);
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}
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int is_redirection(enum e_token_id id)
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{
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if (id == T_LESS) // <
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return (1);
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else if (id == T_GREAT) // >
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return (1);
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else if (id == T_DLESS) // <<
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return (1);
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else if (id == T_DGREAT) // >>
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return (1);
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else
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return (0);
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}
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// count nbr word in cmd, minus redirection and heredoc
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int next_cmd(t_token *token)
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{
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int i;
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i = 0;
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while (token && token->id != T_PIPE)
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{
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if (is_redirection(token->id))
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i--;
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else
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i++;
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token = token->next;
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}
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if (token && token->id == T_PIPE)
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token = token->next;
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return (i);
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}
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void handle_argv(t_token *token, t_cmd **cmd, size_t cmd_nbr)
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{
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int argc;
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int j;
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int i;
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int redirection;
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i = 0;
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while (cmd_nbr)
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{
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argc = next_cmd(token);
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cmd[i]->argv = calloc(argc + 1, sizeof(char *));
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cmd[i]->argv[argc] = NULL;
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j = 0;
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redirection = is_redirection(token->id);
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while (token && token->id != T_PIPE)
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{
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if (!redirection && token->id == T_WORD)
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{
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cmd[i]->argv[j] = ft_strdup(token->content);
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j++;
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}
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redirection = is_redirection(token->id);
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token = token->next;
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}
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if (token && token->id == T_PIPE)
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token = token->next;
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cmd_nbr--;
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i++;
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}
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}
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int fill_builtin(t_cmd *cmd, int (*builtin)(int, char **, t_all *))
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{
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cmd->builtin_command = &builtin;
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return (1);
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}
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int handle_builtin(t_cmd *cmd)
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{
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if (!ft_strncmp(cmd->argv[0], "echo", 4))
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return (fill_builtin(cmd, &builtin_echo));
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// else if (!ft_strncmp(cmd->argv[0], "cd", 2))
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// return (fill_builtin(cmd, &builtin_cd));
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// else if (!ft_strncmp(cmd->argv[0], "pwd", 3))
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// return (fill_builtin(cmd, &builtin_pwd));
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// else if (!ft_strncmp(cmd->argv[0], "export", 6))
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// return (fill_builtin(cmd, &builtin_export));
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// else if (!ft_strncmp(cmd->argv[0], "unset", 5))
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// return (fill_builtin(cmd, &builtin_unset));
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else if (!ft_strncmp(cmd->argv[0], "env", 3))
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return (fill_builtin(cmd, &builtin_env));
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else if (!ft_strncmp(cmd->argv[0], "exit", 4))
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return (fill_builtin(cmd, &builtin_exit));
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return (0);
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}
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void find_path(char **argv, char **envp)
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{
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int i;
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char **path;
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char *cmd;
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i = 0;
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while (envp[i] && ft_strncmp(envp[i], "PATH=", 5))
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i++;
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path = ft_split(envp[i] + 5, ':'); // 5 = lentgh of "PATH="
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i = -1;
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while (*path && i != 0)
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{
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cmd = ft_strjoin(path[0], "/");
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cmd = ft_strjoin(cmd, argv[0]);
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i = access(cmd, X_OK);
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path++;
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}
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if (!(*path))
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exit(0); // gerer erreur
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argv[0] = cmd;
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}
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void handle_path(t_cmd **cmd_arr, char **envp)
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{
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int i;
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i = 0;
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while (cmd_arr[i])
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{
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if (!handle_builtin(cmd_arr[i]))
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find_path(cmd_arr[i]->argv, envp);
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i++;
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}
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}
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void fd_redirection(t_token *token, t_cmd *cmd)
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{
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int flag;
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if (token->id == T_LESS) // '<'
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{
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flag = O_RDONLY | O_CREAT;
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if (cmd->fd_in != 0)
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close(cmd->fd_in);
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cmd->fd_in = open(token->next->content, flag);
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}
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else if (token->id == T_GREAT) // '>'
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{
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flag = O_WRONLY | O_CREAT | O_TRUNC;
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cmd->fd_out = open(token->next->content, flag, S_IRWXU);
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}
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else if (token->id == T_DGREAT) // '>>'
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{
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flag = O_WRONLY | O_CREAT | O_APPEND;
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cmd->fd_out = open(token->next->content, flag, S_IRWXU);
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}
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}
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void fd_heredoc(t_token *token, t_cmd *cmd)
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{
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(void)token;
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(void)cmd;
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}
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void handle_fd(t_token *token, t_cmd **cmd_arr)
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{
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int *pipes_fd;
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int i;
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i = 0;
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while (cmd_arr[i])
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{
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cmd_arr[i]->fd_out = 1;
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while (token && token->id != T_PIPE)
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{
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if (token->id == T_DGREAT) // '<<'
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fd_heredoc(token, cmd_arr[i]);
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else
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fd_redirection(token, cmd_arr[i]);
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token = token->next;
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}
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if (token && token->id == T_PIPE)
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{
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token = token->next;
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pipes_fd = calloc(2, sizeof(int));
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pipe(pipes_fd);
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if (cmd_arr[i]->fd_out == 1)
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cmd_arr[i]->fd_out = pipes_fd[1];
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else
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close(pipes_fd[1]);
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cmd_arr[i + 1]->fd_in = pipes_fd[0];
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}
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i++;
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}
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}
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/* -------------------------------------------------------
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The grammar symbols
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------------------------------------------------------- */
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/*
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%token WORD
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%token LESS // '<'
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%token GREAT // '>'
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%token DLESS // '<<'
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%token DGREAT // '>>'
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%token PIPE // '|'
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*/
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/* -------------------------------------------------------
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The Simplified Grammar
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------------------------------------------------------- */
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/*
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%start program
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%%
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pipeline : command
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| pipeline '|' command
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;
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command : cmd_prefix cmd_name cmd_suffix
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| cmd_prefix cmd_name
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| cmd_name cmd_suffix
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| cmd_name
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;
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cmd_name : WORD // Apply rule 7a
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;
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cmd_prefix : io_redirect
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| cmd_prefix io_redirect
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;
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cmd_suffix : io_redirect
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| cmd_suffix io_redirect
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| WORD
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| cmd_suffix WORD
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;
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io_redirect : io_file
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| io_here
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;
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io_file : '<' filename
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| '>' filename
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| DGREAT filename
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;
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filename : WORD // Apply rule 2
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;
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io_here : DLESS here_end
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;
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here_end : WORD // Apply rule 3
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;
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*/
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